Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

• the most efficient way to navigate the Engineering ToolBox!

# Air - Dynamic and Kinematic Viscosity

The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress .

For further definitions, go to Absolute (dynamic) and kinematic viscosity . Absolute or dynamic viscosity is used to calculate Reynold's Number to determine if a fluid flow is laminar, transient or turbulent.

Tabulated values and viscosity units conversion are given below the figures .

### Online Air Viscosity Calculator

The calculator below can be used to calculate air dynamic or kinematic viscosity at given temperatures and atmospheric pressure.
The output dynamic viscosity is given as Pa*s, N*s/m 2 , cP, mPa*s, lb f *s/ft 2 and lb m /(ft*h),
while the kinematic viscosity is given as cSt, m 2 /s, and ft 2 /s

Note! Temperature must be within the ranges -100 - 1600 °C, -150 - 2900 °F, 175 - 1900 K and 310-3400 °R to get valid values.

Choose the actual unit of temperature:

See also other properties of Air at varying temperature and pressure: Density and specific weight at varying temperature , Density at varying pressure , Diffusion Coefficients for Gases in Air , Prandtl Number , Specific heat at varying temperature and Specific heat at varying pressure , Thermal Conductivity , Thermal Diffusivity , Properties at gas-liquid equilibrium conditions and Air thermophysical properties at standard conditions and Composition and molecular weight ,
as well as dynamic and kinematic viscosity of ammonia , benzene , butane , carbon dioxide , ethane , ethanol , ethylene , methane , methanol , nitrogen , oxygen , propane and water .

Air dynamic and kinematic viscosity at atmospheric pressure and varying temperature:

Air dynamic viscosity at varying temperature and constant pressures (1-10 000 bara, 14.5 - 145 000 psia):

Air kinematic viscosity at varying temperature and constant pressures (1-10 000 bara, 14.5 - 145 000 psia):

Air dynamic and kinematic viscosity at gas-liquid equilibrium pressure:

Dynamic (absolute) and kinematic viscosity of air at 1 atmosphere pressure, at temperatures given as °F:

For full table with kinematic viscosity - rotate the screen!

 Temperature Dynamic Viscosity Kinematic Viscosity [°F] [lb f s/ft 2 *10 -6 ] [lb m /ft h] [μPa s], [N s/m 2 *10 -6 ] [cP], [mPa s] [ft 2 /s *10 -4 ] [cSt], [m 2 /s *10 -6 ] -100 0.2772 0.03211 13.27 0.01327 0.809 7.51 -50 0.3091 0.03580 14.80 0.01480 1.028 9.55 -20 0.3275 0.03794 15.68 0.01568 1.170 10.87 0 0.3395 0.03932 16.25 0.01625 1.267 11.77 10 0.3454 0.04001 16.54 0.01654 1.317 12.24 20 0.3512 0.04068 16.82 0.01682 1.368 12.71 30 0.3570 0.04135 17.10 0.01710 1.420 13.19 40 0.3628 0.04202 17.37 0.01737 1.472 13.67 50 0.3685 0.04268 17.64 0.01764 1.524 14.16 60 0.3741 0.04333 17.91 0.01791 1.578 14.66 70 0.3797 0.04398 18.18 0.01818 1.632 15.16 80 0.3852 0.04462 18.45 0.01845 1.687 15.67 100 0.3962 0.04589 18.97 0.01897 1.799 16.71 120 0.4069 0.04713 19.48 0.01948 1.913 17.78 140 0.4175 0.04835 19.99 0.01999 2.030 18.86 160 0.4279 0.04956 20.49 0.02049 2.150 19.97 180 0.4381 0.05074 20.98 0.02098 2.272 21.11 200 0.4481 0.05191 21.46 0.02146 2.397 22.27 250 0.4726 0.05474 22.63 0.02263 2.719 25.26 300 0.4962 0.05747 23.76 0.02376 3.055 28.38 350 0.5189 0.06010 24.85 0.02485 3.405 31.64 400 0.5409 0.06265 25.90 0.02590 3.769 35.02 450 0.5622 0.06512 26.92 0.02692 4.146 38.52 500 0.5828 0.06751 27.91 0.02791 4.535 42.13 600 0.6224 0.07209 29.80 0.02980 5.349 49.70 700 0.6600 0.07644 31.60 0.03160 6.209 57.68 773 0.6863 0.07949 32.86 0.03286 6.864 63.77 1000 0.7632 0.08840 36.54 0.03654 9.038 83.97 1200 0.8258 0.09565 39.54 0.03954 11.12 103.3 1400 0.8844 0.1024 42.35 0.04235 13.34 123.9 1600 0.9397 0.1088 44.99 0.04499 15.70 145.8 1800 0.9919 0.1149 47.49 0.04749 18.18 168.9 2000 1.042 0.1207 49.87 0.04987 20.79 193.1

Dynamic (absolute) and kinematic viscosity of air at 1 atmosphere pressure, at temperatures given as °C:

For full table with kinematic viscosity - rotate the screen!

 Temperature Dynamic Viscosity Kinematic Viscosity [°C] [μPa s], [N s/m 2 *10 -6 ] [cP], [mPa s] [lb f s/ft 2 *10-6] [lb m /ft h] [cSt], [m 2 /s *10 -6 ] [ft 2 /s*10 -4 ] -75 13.18 0.01318 0.2753 0.03188 7.40 0.796 -50 14.56 0.01456 0.3041 0.03523 9.22 0.992 -25 15.88 0.01588 0.3317 0.03842 11.18 1.203 -15 16.40 0.01640 0.3425 0.03966 12.01 1.292 -10 16.65 0.01665 0.3477 0.04028 12.43 1.338 -5 16.90 0.01690 0.3530 0.04089 12.85 1.383 0 17.15 0.01715 0.3582 0.04149 13.28 1.430 5 17.40 0.01740 0.3633 0.04209 13.72 1.477 10 17.64 0.01764 0.3685 0.04268 14.16 1.524 15 17.89 0.01789 0.3735 0.04327 14.61 1.573 20 18.13 0.01813 0.3786 0.04385 15.06 1.621 25 18.37 0.01837 0.3836 0.04443 15.52 1.671 30 18.60 0.01860 0.3885 0.04500 15.98 1.720 40 19.07 0.01907 0.3983 0.04614 16.92 1.822 50 19.53 0.01953 0.4080 0.04725 17.88 1.925 60 19.99 0.01999 0.4175 0.04835 18.86 2.030 80 20.88 0.02088 0.4361 0.05051 20.88 2.248 100 21.74 0.02174 0.4541 0.05260 22.97 2.473 125 22.79 0.02279 0.4760 0.05513 25.69 2.765 150 23.80 0.02380 0.4971 0.05758 28.51 3.069 175 24.78 0.02478 0.5176 0.05995 31.44 3.384 200 25.73 0.02573 0.5374 0.06225 34.47 3.710 225 26.66 0.02666 0.5567 0.06448 37.60 4.047 300 29.28 0.02928 0.6115 0.07083 47.54 5.117 412 32.87 0.03287 0.6865 0.07952 63.82 6.869 500 35.47 0.03547 0.7409 0.08581 77.72 8.366 600 38.25 0.03825 0.7988 0.09252 94.62 10.19 700 40.85 0.04085 0.8532 0.09883 112.6 12.12 800 43.32 0.04332 0.9047 0.1048 131.7 14.17 900 45.66 0.04566 0.9535 0.1104 151.7 16.33 1000 47.88 0.04788 1.000 0.1158 172.7 18.59 1100 50.01 0.05001 1.045 0.1210 194.6 20.95

Unit conversion:

Viscosity Dynamic, Absolute
centipoise [cP], gram/(centimeter second) [g/(cm s)] = poise [P],  kilogram/meter second [kg/m s]=newton second/square meter [N s/m 2 ]= pascal second [Pa s], pound/(foot hour) [lb/(ft h)], pound/(foot second) [lb/(ft s)], reyn [reyn]

• 1 cP = 0.001 Pa s = 0.01 P = = 0.01 g/(cm sec) = 6.72197x10 -4 lb/(ft s) = 2.4191 lb/(ft h)
• 1 lb/(ft h) = 0.00027778 lb/(ft s) = 0.00041338 Pa s = 0.0041338 P = 0.41338 cP
• 1 lb/(ft s) = 3600 lb/(ft h) = 1.48816 Pa s = 14.8816 P = 1488.16 cP
• 1 kg/(m s ) = 1 (N s)/m 2 = 1 Pa s = 10 P = 1000 cP = 0.672197 lb/(ft s) = 2419.09 lb/(ft h)
• 1 (N s)/m 2 = 1 kg/(m s ) = 1 Pa s = 10 P = 1000 cP = 0.672197 lb/(ft s) = 2419.09 lb/(ft h)
• 1 P = 1 g/(cm s) = 0.1 Pa s = 100 cP = 0.067197 lb/(ft s) = 241.909 lb/(ft h)
• 1 Pa s = 1 kg/(m s) = 1 (N s)/m 2 = 10 P = 1000 cP = 0.672197 lb/(ft s) = 2419.08 lb/(ft h) =  0.00014504 reyn
• 1 reyn = 6894.76 Pa s

Viscosity Kinematic
centistoke [cSt] = square millimeter/second [mm 2 /s], square foot/hour [ft 2 /h], square foot/second [ft 2 /s], square inch/second [in 2 /s], square meter/hour [m 2 /h], square meter/second [m 2 /s], stoke [St] = square centimeter/second [cm 2 /s]

• 1 cm 2 /s = 1 St = 100 mm 2 /s = 100 cSt = 1x10 -4 m 2 /s = 0.36 m 2 /h = 1.07639x10 -3 ft 2 /s = 3.875008 ft 2 /h = 0.1550003 in 2 /s
• 1 cSt = 1 mm 2 /s = 0.01 St = 1x10 -6 m 2 /s = 0.0036 m 2 /h = 1.07639x10 -5 ft 2 /s = 0.03875008 ft 2 /h = 0.001550003 in 2 /s
• 1 ft 2 /h = 2.7778x10 -4 ft 2 /s = 0.04 in 2 /s = 2.58064x10 -5 m 2 /s = 0.09290304 m 2 /h = 25.8064 cS = 0.258064 St
• 1 ft 2 /s = 3600 ft 2 /h = 144 in 2 /s = 0.09290304 m 2 /s = 334.451 m 2 /h = 92903.04 cSt = 929.0304 St
• 1 in 2 /s = 0.0069444 ft 2 /s = 25 ft 2 /h = 0.00064516 m 2 /s = 2.322576 m 2 /h = 645.16 cSt = 6.4516 St
• 1 m 2 /h = 1/3600 m 2 /s = 2.7778x10 -4 m 2 /s = 2.7778 cm 2 /s = 277.78 mm 2 /s = 277.78 cSt = 2.7778 St = 0.00298998 ft 2 /s = 10.7639 ft 2 /h = 0.430556 in 2 /s
• 1 m 2 /s = 3600 m 2 /h = 1x10 4 cm 2 /s = 1x10 4 St = 1x10 6 mm 2 /s = 1x10 6 cSt = 10.7639 ft 2 /s = 38750.08 ft 2 /h = 1550003 in 2 /s
• 1 mm 2 /s = 1 cSt = 1x10 -6 m 2 /s = 0.0036 m 2 /h = 0.01 cm 2 /s = 0.01 St = 1.07639x10 -5 ft 2 /s = 0.03875008 ft 2 /h = 0.001550003 in 2 /s
• 1 St = 1 cm 2 /s = 100 cSt = 100 mm 2 /s = 1x10 -4 m 2 /s = 0.36 m 2 /h = 1.076x10 -3 ft 2 /s = 3.875008 ft 2 /h = 0.1550003 in 2 /s

## Related Topics

### • Air Psychrometrics

Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.

### • Fluid Mechanics

The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.

### • Gases and Compressed Air

Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.

### • Material Properties

Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.

### • Viscosities

Viscosities of products and chemical species at varying conditions.

## Related Documents

### Absolute or Dynamic Viscosity Online Converter

Convert between dynamic or absolute viscosity units - Poiseuille, Poise, centPoise and more.

### Air - Composition and Molecular Weight

Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.

### Air - Density vs. Pressure and Temperatures

Air density at pressure ranging 1 to 10 000 bara (14.5 - 145000 psi) and constant selected temperatures.

### Air - Density, Specific Weight and Thermal Expansion Coefficient vs. Temperature and Pressure

Online calculator, figures and tables showing density, specific weight and thermal expansion coefficients of air at temperatures ranging -100 to 1600 °C (-140 to 2900 °F) at atmospheric and higher pressure - Imperial and SI Units.

### Air - Diffusion Coefficients of Gases in Excess of Air

Diffusion coefficients (D12) for gases in large excess of air at temperatures ranging 0 - 400 °C.

### Air - Humidity Ratio

The mass of water vapor present in moist air - to the mass of dry air.

### Air - Moisture Holding Capacity vs. Temperature

The moisture holding capacity of air increases with temperature.

### Air - Molecular Weight and Composition

Dry air is a mixture of gases where the average molecular weight (or molar mass) can be calculated by adding the weight of each component.

### Air - Prandtl Number

Prandtl number for air vs. temperature and pressure.

### Air - Properties at Gas-Liquid Equilibrium Conditions

Properties of air change along the boiling and condensation curves (temperature and pressure between triple point and critical point conditions). An air phase diagram included.

### Air - Specific Heat vs. Pressure at Constant Temperature

Figures and tables with isobaric (Cp) and isochoric (Cv) specific heat of air at constant temperature and pressure ranging 0.01 to 10000 bara.

### Air - Specific Heat vs. Temperature at Constant Pressure

Online calculator with figures and tables showing specific heat (Cp and Cv) of dry air vs. temperature and pressure. SI and imperial units.

### Air - Thermal Conductivity vs. Temperature and Pressure

Online calculator with figures and tables showing air thermal conductivity vs. temperature and pressure. SI and imperial units.

### Air - Thermal Diffusivity vs. Temperature and Pressure

Figures and tables withdry air thermal diffusivity vs. temperarure and pressure. SI and Imperial units.

### Air - Thermophysical Properties

Thermal properties of air at different temperatures - density, viscosity, critical temperature and pressure, triple point, enthalpi and entropi, thermal conductivity and diffusivity and more.

### Air Conditioning - Cooling of Air and Condensate Generated

Water may condensate when air is cooled in air conditioning systems.

### Benzene - Dynamic and Kinematic Viscosity vs. Temperature and Pressure

Online calculator, figures and table showing dynamic and kinematic viscosity of benzene, C6H6, at varying temperature and pressure - Imperial and SI Units.

### Butane - Dynamic and Kinematic Viscosity vs. Temperature and Pressure

Online calculators, figures and tables with dynamic and kinematic viscosity of liquid and gaseous butane, C4H10, at varying temperarure and pressure, SI and Imperial units.

### Compressed Air - Pressure Drop Diagrams, Metric Units

Pressure loss in compressed air pipe lines.

### Dry Air - Thermodynamic and Physical Properties

Thermodynamic properties of dry air - specific heat, ratio of specific heats, dynamic viscosity, thermal conductivity, Prandtl number, density and kinematic viscosity at temperatures ranging 175 - 1900 K.

### Dynamic (Absolute) Viscosity - Converting Chart

Convert dynamic viscosity values between units like Poiseuille - Poise - centiPoise and more.

### Ethanol - Dynamic and Kinematic Viscosity vs. Temperature and Pressure

Online calculator, figures and tables showing dynamic and kinematic viscosity of ethanol, C2H5OH, at varying temperature and pressure - Imperial and SI Units.

### Ethylene - Dynamic and Kinematic Viscosity vs. Temperature and Pressure

Online calculator, figures and tables showing dynamic and kinematic viscosity of ethylene, C2H4, also called ethene or acetene, at varying temperature and pressure - Imperial and SI Units.

### Kinematic Viscosity - Online Converter

Convert between kinematic viscosity units like centistokes, poise, lentor and more.

### Methane - Dynamic and Kinematic Viscosity vs. Temperature and Pressure

Online calculator, figures and tables showing dynamic and kinematic viscosity of methane, CH4, at varying temperature and pressure - Imperial and SI Units.

### Moist Air - Specific Volume

Specific volume of moist air is defined as the total volume of humid air per mass unit of dry air

### Moist Air - Weight of Water Vapor

Weight of water vapor in air

### Oxygen - Dynamic and Kinematic Viscosity vs. Temperature and Pressure

Online calculator, figures and tables showing dynamic and kinematic viscosity of oxygen, O2, at varying temperature and pressure - Imperial and SI Units.

### Propane - Dynamic and Kinematic Viscosity vs. Temperature and Pressure

Online calculators, figures and tables showing dynamic and kinematic viscosity of liquid and gaseous propane at varying temperarure and pressure, SI and Imperial units.

### Solubility of Air in Water

The amount of air that can be dissolved in water decreases with temperature and increases with pressure.

### Steam - Viscosity vs. Pressure

Absolute viscosity of steam at pressure ranging 1 - 10000 psia.

### Viscosity - Absolute (Dynamic) vs. Kinematic

Vicosity is a fluid's resistance to flow and can be valued as dynamic (absolute) or kinematic.

### Viscosity - Converting Chart

Convert between viscosity units like Centiposes, milliPascal, CentiStokes and SSU.

## Search Engineering ToolBox

• the most efficient way to navigate the Engineering ToolBox!

## SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!